Optically addressed spatial light modulating system and method f

Details Optically addressed spatial light modulating system and method f Optically addressed spatial light modulating system and method f

1995-05-11

1997-12-02

Sikes, William L.

Liquid crystal cells, elements and systems

Liquid crystal system

349 27, 349 57, 349 37, G02F 1135, G02F 1141

Patent

active

056941820

ABSTRACT:
An optically addressed spatial light modulation system includes a ferroelectric liquid crystal spatial light modulator. A writing light source irradiates a writing light for recording an image onto the spatial light modulator. A read-out light source irradiates a bias light for adjusting the sensitivity of the spatial light modulator and a read-out light for reading a recorded image from the spatial light modulator. An adjusting circuit is used to adjust the bias light intensity or irradiation time in synchronism with the writing light to increase the sensitivity of the spatial light modulator. A driving circuit supplies writing voltage signals to the spatial light modulator. The irradiation times of the write light and the bias light overlap with the application of the writing voltage signals for a predetermined time for adjusting the sensitivity of the spatial light modulator.

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Athale et al "Bistability and Thresholding by a new Photoconductor-Twisted Nematic Liquid Crystal Device with Optical Feedback" Applied Optics, vol. 20, No. 8, Apr. 1981, pp. 1424-1432.

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